What do you do if your girlfriend is cheating on you for your best friend?

Then you're not really being a good friend!You know what he is doing is not right!So,from the looks of it you have two choices you can make.1)Tell your best friend what he is doing OR 2)Be a bad friend and secretly go out with him with guilt bottled up in you FOREVER!I hope you choose wisely,because we all know what's right,but sometimes we don't do it.....